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Home > Maintenance & Mods (L322) > Cabin dB(A) - Can a 5.0 SC L322 Match a Rolls‑Royce
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JonnyCJ



Member Since: 12 Mar 2024
Location: Wirral
Posts: 272

United Kingdom 2012 Range Rover Vogue SE 4.4 V8 Sumatra Black

I'd pay to go to the cinema to watch this !

Post #723037 18th Aug 2025 1:11pm
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Salter121



Member Since: 20 Jun 2018
Location: Berkshire
Posts: 136

United Kingdom 2012 Range Rover Autobiography 5.0 SC V8 Sumatra Black

Update – Roof Treatment Completed

The roof is now finished, with around 95% Silent Coat coverage across the metal skin. Over this I applied a complete multi-layer of 6 mm and 12 mm CCF, then reinstalled the factory felt as the top layer. It’s striking how little sound treatment Land Rover applied to the roof from the factory — the bare metal resonates like a drum until you work it properly.

On the headliner side, I added additional strips of 6 mm CCF. Not a huge amount, but just enough to give a further barrier and to remove the resonance from the headliner board itself, which is little more than pressed cardboard. Care was needed here to avoid adding too much weight and, most importantly, to ensure nothing interfered with the curtain airbags.

The hardest section was the cavity in front of the sunroof. I removed the small rubber grommets on each side and then painstakingly fed in strips of CCF until the space was fully packed — a slow job, but it worked perfectly.

I decided not to completely drop the headliner as I didn’t want the complexity of refitting it around the sunroof cassette. Everything was completed without removing it fully, which saved time and hassle, and the end result has made a noticeable difference to noise levels.

To ensure the headliner was refitted correctly and resisted sagging, I used a strategic amount of Tiger Seal at key anchor points. This has locked everything into place firmly while preserving the clean factory look.









 2012 Range Rover L322 5.0 SC Autobiography – Sumatra Black
2010 Land Rover Freelander 2 HSE L359 – Grey
2015 Jeep Grand Cherokee Summit WK2 – Grey
1999 Mercedes E320 W210 – Silver

Post #723347 24th Aug 2025 8:24am
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Red Hot one



Member Since: 09 Dec 2018
Location: Herefordshire
Posts: 222

United Kingdom 2009 Range Rover Vogue TDV8 Stornoway Grey

I have to admit that I am fascinated by your work, taking the whole interior out would be enough to make me cry, let alone put it all back together again with the sound deadening to add to the complexity, you have my respect. Bow down Bow down

Post #723353 24th Aug 2025 10:41am
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Salter121



Member Since: 20 Jun 2018
Location: Berkshire
Posts: 136

United Kingdom 2012 Range Rover Autobiography 5.0 SC V8 Sumatra Black

Update – Rear Seat Isolation Attempt

The idea of isolating the rear seats with rubber gaskets didn’t work out. Once reinstalled, the extra thickness meant the latch couldn’t grab the bar properly to lock the seats in place. In the end I had to remove the gaskets and replace them with a thin layer of 2 mm Silent Coat. It still provides a degree of isolation, though not as much as I’d hoped, but the tolerances on the rear seats are just too tight for anything more drastic.

I don’t expect the same issue on the front seats, where there’s more room to work with. At one stage I considered modifying the brackets and fixing the rear seats in a permanent non-folding position, but decided against it for practicality.

Click image to enlarge
 2012 Range Rover L322 5.0 SC Autobiography – Sumatra Black
2010 Land Rover Freelander 2 HSE L359 – Grey
2015 Jeep Grand Cherokee Summit WK2 – Grey
1999 Mercedes E320 W210 – Silver

Post #723440 25th Aug 2025 8:15pm
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Cam-Tech-Craig



Member Since: 04 Aug 2011
Location: Gloucestershire
Posts: 16398

England 2015 Range Rover SVAutobiography SDV8 Loire Blue

I soundproofed the Aston whilst having the interior refinished and my goodness what a difference it made... Astonishing... Good luck with your project sir. I hope your as pleased as I was with my results... Thumbs Up

Post #723451 26th Aug 2025 12:48am
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addict



Member Since: 04 May 2023
Location: Boston, MA
Posts: 3

United States 2010 Range Rover Supercharged 5.0 SC V8 Galway Green

this is incredible -- subscribed.

I sound deadened my doors and trunk and was impressed with the results, this is next level!

Post #723547 27th Aug 2025 8:16pm
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